move liquid back to center (if possible) before resetting sides

PipeTransportLiquids.patch

diff --git a/buildcraft/common/net/minecraft/src/buildcraft/transport/PipeTransportLiquids.java b/buildcraft/common/net/minecraft/src/buildcraft/transport/PipeTransportLiquids.java
index cd91009..0164797 100755
--- a/buildcraft/common/net/minecraft/src/buildcraft/transport/PipeTransportLiquids.java
+++ b/buildcraft/common/net/minecraft/src/buildcraft/transport/PipeTransportLiquids.java
@@ -501,8 +501,9 @@ public class PipeTransportLiquids extends PipeTransport implements ILiquidContai
 
 			pos.moveForwards(1);
 
-			if (!canReceiveLiquid(pos)) {				
-				side[i].reset ();
+			if (!canReceiveLiquid(pos)) {
+				center.fill(side[i].qty, true, side[i].liquidId);
+				side[i].reset();
 			}
 		}
 	}